Tire Sidewall problems of the 2010 Dodge Caravan

I purchased a set (4) goodyear assurance fuel max tires that were installed in August 2011 on a 2010 Dodge Caravan se. After driving less than 25000 miles on them in just under 6 months the driver side front tire failed in a snow storm. There were no signs of a puncture in the tread nor did I hit a pothole. Unfortunately, the tire sidewalls shredded because I had to drive a distance to get to a safer place to pull over. Before having the tire replaced by goodyear, which I had to pay for, I had the damaged tire inspected by the service department at a local Dodge dealer. Less than 2 weeks later, the rear tire on the driver side failed. The weather was not a factor as it was unseasonably warm in ohio for January. Again, there appears to be no signs of puncture damage or other tread damage. I rotate my tires every other oil change which due to the amount of miles I drive is usually close to every other month for the rotation. The date of the first tire failure was January 19, 2012 and the date of the second tire failure was January 30, 2012.